Originally Posted by
Looigi
I guess it could be accidental that GXP cranks fit, but I think it's more likely that when designing the BB90 spec, they chose to allow it to accommodate GXP cranks.
Note I did point out in my earlier post that this was a Madone 6, but with SRAM cranks.
The main difference in the SRAM GXP is NDS spindle diameter. All Shimano spaced bbs can take a SRAM. It's not that nearly as much as it is the cranks and spacing, which is what people are wondering about in this thread, are not the same. That's all I am trying to point out.